在超声波辅助及哌啶和聚乙二醇-400的协同作用下,通过1-甲基-3-乙酰基-4-羟基-2-喹啉酮与芳香醛的Aldol缩合反应,合成了1-甲基-3-肉桂酰基-4-羟基-2-喹啉酮.该缩合产物在I2促进下,经过分子内的环化反应,成功制备了一系列吡喃并[3,2-c]喹啉-4,5-二酮衍生物.该方法具有反应操作简单、条件温和、收率良好的特点.
An efficient method for the synthesis of pyrano[3,2-c]quinoline-4,5-dione derivatives via iodine promoted intramolecular cyclization of 1-methyl-3-cinnamoyl-4-hydroxyquinolin-2-one, synthesized from aldol condensation of 1-methyl-3-acetyl-4-hydroxyquinolin-2-one with aromatic aldehydes in the presence of pyridine and PEG-400 under ultrasound irradiation, has been described. This method offers the advantages of a green approach, easy work-up, mild conditions and good yields.